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GP Acoustics (UK) Ltd, Eccleston Road, Tovil, Maidstone, Kent, ME15 6QP U.K. Telephone: + 44 (0)1622 672261 Fax: + 44 (0)1622 750653
KEF America Inc, 10 Timber Lane, Marlboro, New Jersey 07746 U.S.A. Telephone: +(1) 732 683 2356 Fax: +(1) 732 683 2358
GP Acoustics GmbH, Heinrichstraße 51, D-44536 Lünen, Deutschland. Telephone: +49 (0) 231 9860-320. Fax: +49 (0) 231 9860-330GP Acoustics (France) SAS, 39 Rue des Granges Galand - BP414, 37554 Saint Avertin CEDEX, France. Tel : +33(0)2 47 80 49 01 Fax : +33(0)2 47 27 89 64
KEF and Uni-Q are registered trademarks. Uni-Q is protected under GB patent 2 236929, U.S. Pat. No. 5,548,657 and other worldwide patents.KEF reserve the right, in line with continuing research and development, to amend or change specifications. Dolby, Pro Logic, and the double-D symbol areregistered trademarks of Dolby Laboratories. DTS is a registered trademark of Digital Theatre Systems Inc.
PL1627EN
www.kef.com
www.kef.com
K1271_3000 series brochure 10/1/11 11:56 Page 1
A quest for perfection…
When you've been innovating for nearly 50 years, staying ahead of the game becomes second
nature. So as soon as the digital home entertainment revolution kicked off,
we designed the KEF Home Theatre concept to sound, look and feel better
than anything else for the price. And the KEF KHT2005 (left)
earned the awards and 5-star ratings to prove it.
But innovators don't stand still. We set about improving every single component to raise the
bar in terms of freedom from distortion, power handling and optimising KEF's unique
‘sit anywhere’ point source sound dispersion technology. The 3000 series is the
result, and it's much more than just an evolution from its award-winning
predecessors - it's a revolution. Smoother. Sweeter. More dynamic.
KEF home theatre 3000 series
The secret of KEF home theatre
KEF’s patented ‘sit anywhere’ Uni-Q® driver configuration, places the tweeter in the acoustic centre
of the bass/midrange cone. This creates a single focused audio source that disperses the sound
image evenly throughout the room so that everyone enjoys the full richness of music or
movie soundtracks.
The Uni-Q array in the 3000 series has a completely new design which performs better than ever.
Instead of having identical centre and satellite speakers like other systems, we've created a
stunning new dedicated centre channel that gives dialogue more weight and clarity delivering
cinema-like frontal impact. We've also added a radical new high performance powered subwoofer.
As a system, it certainly puts the 'live' into living room.
K1271_3000 series brochure 10/1/11 11:56 Page 3
K1271_3000 series brochure 10/1/11 11:56 Page 5
Satellite Speakers
Clearly an evolution - in styling terms - of the signature
egg shape, the 3000 series is a completely new design that
looks better and sounds sweeter than anything else in
its class.
The new 115mm (4.5in.) Uni-Q driver of the HTS3001
satellite speaker has been comprehensively engineered
for even cleaner, smoother response. An improved
magnet system delivers even heftier bass by allowing
greater movement of the speaker cone. KEF’s all-new
sealed suspension technology (SST)TM fills in the gap
between midrange cone and tweeter to produce a
markedly more powerful, cleaner sound. Distinctive
radial ribs on the midrange cone improve its rigidity for
pure, clean vocal effects with exceptionally low
distortion. The cast aluminium enclosures are shaped to
minimise internal resonance so that the satellites fill the
room with a lush and incredibly detailed 3D sound.
The attention to detail is plain to see, from the depth of
the gloss finish to the ingeniously simple wall mounting
bracket system.
Dynamic. Perfectly balanced. Seamlessly integrated.
K1271_3000 series brochure 10/1/11 11:56 Page 7
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Carrying up to
60% of the sound,
the centre channel is vital
in any home theatre system,
and the new dedicated centre speaker
of the 3000 Series is in a class of its own.
With the same new generation 115mm (4.5in.) Uni-Q array as the
satellites, flanked by two additional 75mm (3in.) bass drivers, the hefty
frontal impact is complemented by amazingly clear dialogue. And the
response is so superbly integrated across the frequency range that you
soon forget you’re listening to a recorded signal. It sounds astonishingly
true to life.
Centre Speaker
K1271_3000 series brochure 10/1/11 11:56 Page 11
K1271_3000 series brochure 10/1/11 11:56 Page 13
It’s the first subwoofer at this price level that you won’t
want to hide away out of sight. With an ultra-reliable,
high efficiency, 250W class D amplifier powering a
250mm (10in.) driver with a matching auxiliary bass
radiator, the radical HTB2 model subwoofer anchors
the 3D sound image with stunningly realistic low
frequency reproduction.
Whether you prefer to position it vertically or
horizontally, the story’s the same: an acoustically inert
enclosure shaped to eliminate internal standing waves,
extremely fast response and SmartBassTM
‘connect and go’ versatility with
simple bass boost and
phase controls.
Subwoofer
K1271_3000 series brochure 10/1/11 11:56 Page 15
An important element of loudspeaker
design is the ability to produce sound
which is as close as possible to the original
source. Distortion is the main factor
that impacts upon the quality of the
sound reproduced.
A distortion level of below 2% for a
loudspeaker is considered to be excellent.
The KEF 3000 series performs within a
0.3-0.8% band, considerably better than
this benchmark. See the distortion chart3
left, which shows the measurements
of the KEF 3000 series (green line)
against its predecessor, the award winning
KHT2005.2 series (red line).
‘Sit anywhere’ Uni-Q Technology
KEF's patented Uni-Q driver configuration
uses aerospace technology to mount the
tweeter in the acoustic centre of the
bass/midrange cone. This allows both to act
as a single focused source that disperses
the sound image evenly throughout the
room, so you experience the same 3D
sound wherever you sit.
The all-new Uni-Q driver array of the 3000
series has been comprehensively engineered
for even cleaner response. The midrange
cone now produces smoother sound
thanks to radial reinforcing ribs for more
‘piston-like’ behaviour1, and its rubber
surround has been re-profiled to deliver
superior bass extension.
The images on the left show scans from
KEF’s Laser Doppler Vibrometer2 illustrating
how speaker cones deform in normal
operation. The difference is plain to see,
the KEF 3000 series suffers less break-up
and hence produces cleaner sound.Typical loudspeaker
coneKEF home theatre3000 series cone
Grilles
The grilles on the centre and satellite
speakers are held in position by magnets,
giving a high quality, tactile feel, and because
it’s a closed loop magnet system, they won’t
interfere with your TV or any other nearby
electronic equipment.
Very KEF - a typically ingenious touch.
Satellite and Centre Technology
1 A piston-like motion of a speaker cone, with less deformation and break-up produces cleaner, less distorted sound.2 The KEF Laser Doppler Vibrometer is a scanning laser device that measures the precise diffraction of light from a moving device (in this
case the midrange speaker cone). Using this technique very small vibrations, normally invisible to the naked eye, can be recorded,amplified and then viewed on a computer. (Measurement taken at 1500Hz).
3 Distortion measured at 90dB.
Stands
The standard elliptical shelf
stands, supplied with each
satellite and centre speaker,
double up as unobtrusive wall
brackets, and allow your
satellites to be stably
oriented in any direction.
The elegantly simple
optional matt finished floor
stands (right) complement
the satellite speakers in both
form and function.
Finishes
When you're buying audiophile quality
sound, you want your system to look the
part. The 3000 series comes in a choice of
High Gloss Black or High Gloss Silver
finishes; whichever you choose, you'll find
that the surface reflections echo the
distinctively smooth contours of the
enclosures.
If you think the look makes a statement,
wait till you hear the sound.
Sealed Suspension Technology
KEF’s unique new Sealed Suspension
Technology – SSTTM (patent applied
for) dramatically improves sound
quality at higher volumes as it
effectively seals the gap between
the moving mid-range cone and tweeter
(see diagram above).
“Improving upon the already near perfect
design wasn’t easy. We had to make a
rubber seal that was light enough to move
with a speaker without affecting the sound,
it’s a genuine innovation.”
KEF Research Engineer, Jack Oclee-Brown.
K1271_3000 series brochure 10/1/11 11:56 Page 17
Specifications
Model HTS3001 Satellite HTC3001 Centre HTB2 Subwoofer
Design Bass reflex two-way Closed box three-way Powered SubwooferPassive radiator
Drive Unit Array 115mm (4.5in.) Uni-Q 115mm (4.5in.) Uni-Q 1 x 250mm (10in.)19mm (0.75in.) aluminium HF 19mm (0.75in.) aluminium HF 1 x 250mm (10in.) ABR
2 x 75mm (3in.) LF
Frequency Range 70Hz - 55kHz 65Hz - 55kHz 30Hz - 250Hz
Amplifier Requirement 10 - 100 Watts 10 - 100 Watts 250 Watts built in
Sensitivity (2.83V/1m) 88dB 90dB n/a
Maximum Output 108dB SPL @ 1m 110dB SPL @ 1m 110dB SPL @ 1m
Impedance 8Ω 8Ω n/a
Internal Volume 1.75 litres 2.4 litres 15 litres
Weight 2kg (4.5lbs) 2.6kg (5.8lbs) 11.3kg (24.9lbs)
vertical:Dimensions (H x W x D) 245 x 125 x 150 mm 130 x 300 x 185 mm 390 x 440 x 195 mm
9.6 x 4.9 x 5.9 in. 5.1 x 11.8 x 7.3 in. 15.4 x 17.3 x 7.7 in.
horizontal:227 x 440 x 385 mm8.9 x 17.3 x 15.2 in.
Finish High Gloss Black or High Gloss Black or High Gloss Black orHigh Gloss Silver High Gloss Silver High Gloss Silver
Dispersion Over 90º arc with 2dB Over 90º arc with 2dBreference, both horizontal reference, both horizontaland vertical and vertical
Harmonic Distortion 2nd and 3rd harmonics 2nd and 3rd harmonics(90dB, 1m) (90dB, 1m)<0.8% 120Hz - 30kHz <0.8% 120Hz - 30kHz<0.3% 250Hz - 22kHz <0.3% 250Hz - 22kHz
Crossover Frequency 2.2kHz 500Hz / 2.2kHz
Power Requirements 100 - 240V ac 50 - 60Hz
Subwoofer Drive Unit
Heavy weight long-throw motor design with
aluminium Faraday ring for reduced
distortion.
Magnetically shielded.
4-layer copper coil for high power capacity.
FEA1 optimised coil and magnet design to
give a linear BL profile2.
Rear suspension and surround are FEA
optimised to give maximum linear excursion,
resulting in reduced distortion.
Auxiliary Bass Radiator (ABR)
Balanced, symmetrical, low profile ABR
design for more linear excursion and
reduced distortion.
Internally vented ABR air cavity resulting
in less compliance damping giving better
LF performance.
1 FEA = Finite Element Analysis - a design process where individual elements are computer modelled.2 BL profile = measurement of the motor force factor on the speaker driver over the working displacement of the magnetic coil.3 Opto-coupled LED and light sensitive resistor senses overdrive and automatically limits this to prevent damage to the unit.
Electronics
Highly efficient 250W class D
amplifier.
Thermal and overcurrent
protection built into the
amp and power supply
unit ensuring ultra reliable
performance.
Sophisticated limiter system to
prevent voltage overload,
optimised for maximum
audio quality3.
Subwoofer Technology
Items are available separately, or packaged as a complete system.GP Acoustics (UK) Ltd. reserve the right, in line with continuous research and development, to amend or change specifications withoutprior notice. E. & O.E.
K1271_3000 series brochure 10/1/11 11:56 Page 19